Allowing Relaying with sendmail

Add (access_db) feature to the m4 file for sendmail. The m4 file on solaris 9 can be found in /usr/lib/mail/cf

The standard server sendmail m4 file is called main.mc. If this is the first time you have edited it, copy it to a different filename so that you know that it is not the standard one, eg myconfig.mc

If however you already have a custom sendmail file, eg in this case myconfig.mc, copy it to new filename eg myconfig2.mc

previously the file myconfig.mc looked like :


divert(-1)
#
#

divert(0)dnl
VERSIONID(`@(#)myconfig.mc	1.0 (MYCONFIG) 05/05/03')
OSTYPE(`solaris8')dnl
DOMAIN(`solaris-generic')dnl
MAILER(`local')dnl
MAILER(`smtp')dnl
MASQUERADE_AS(`mydomain.com')dnl

Now the file myconfig2.mc looks like:


divert(-1)
#
#

divert(0)dnl
VERSIONID(`@(#)myconfig.mc	1.0 (JAW) 05/05/03')
OSTYPE(`solaris8')dnl
DOMAIN(`solaris-generic')dnl
MAILER(`local')dnl
MAILER(`smtp')dnl
FEATURE(`access_db')dnl
MASQUERADE_AS(`mydomain.com')dnl

Note the extra FEATURE line to add the access_db feature.

Edit the Makefile to make the new config file as well as the standard main.cf and subsidiary.cf.

run make to make the new custom sendmail config file - this will be called myconfig2.cf

copy the new config file to /etc/mail/sendmail.cf

edit /etc/mail/access to add the hosts that you want to allow relaying for
eg.
1.2.3.4 RELAY
Now we need to make the access table into a map. There are different formats like hash dbm etc. These can be seen by typing 'makemap -l'. The default is type hash which will produce a .db file.

# makemap hash /etc/mail/access < /etc/mail/access

then restart Sendmail. (# /etc/rc2.d/S88sendmail stop; /etc/rc2.d/S88sendmail start
done !